This is exactly why. It would destroy incentive to play both modes, straight up.
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Didn't Bungie once say you can play destiny any way you want? I could be wrong.
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As long as "you" implies a plural party that they won't help you matchmake when it matters, and "how you want" means within the bounds of how they allow you to play, subject of course to arbitrary patching :)
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That was the point of it in the first place, not playing PvP.